Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 41, NWS Austin/San Antonio, TX

August 31, 2001DeWitt County, Lavaca County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 31, 2001, 4:00 AM CDT for DeWitt County, Lavaca County, Texas. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Aug 31, 2001, 4:00 AM CDT (09:00 UTC)
Expired
Aug 31, 2001, 8:00 AM CDT
In force
4 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties DeWitt County, TX, Lavaca County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 9.0 hours before the alert went out and 160 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Corpus Christi, TX at 00:00Z on 2001-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3264 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 00:00Z on 2001-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
3264 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
567 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KEWX 310900
FFWSAT
FFWSAT
TXC123-285-311300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
400 AM CDT FRI AUG 31 2001

THE NATIONAL WEATHER SERVICE HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  LAVACA
  DEWITT

* UNTIL 800 AM CDT

* AT 355 AM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  FROM CUERO TO HALLETTSVILLE...MOVING NORTHEAST AT 10 MPH.

NATIONAL WEATHER SERVICE DOPPLER RADARS HAVE ESTIMATED 4 TO 6 INCHES 
OF RAIN HAVE FALLEN OVER NORTHERN DEWITT COUNTRY IN THE PAST 3 
HOURS...AND 3 TO 4 INCHES OF RAIN IN THE PAST 2 HOURS FROM YOAKUM TO 
HALLETTSVILLE IN LAVACA COUNTY.  ADDITIONAL SHOWERS AND THUNDERSTORMS 
ALONG THE COASTAL PLAINS ARE MOVING NORTHEAST...AND WILL CONTINUE TO 
MOVE ACROSS THE AREAS DURING THE PREDAWN HOURS. 

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.


LAT...LON 2899 9764 2893 9730 2934 9667 2959 9709

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 31, 1:55 AM CDTFlash Flood WarningEWXDeWitt, Lavaca2 hr
Aug 31, 3:33 AM CDTFlash Flood WarningEWXGonzales3 hr
Aug 31, 4:43 AM CDTFlash Flood WarningEWXBexar, Caldwell, Comal, Guadalupe, Hays3 hr
Aug 31, 6:28 AM CDTFlash Flood WarningEWXGonzales3 hr
Aug 31, 7:37 AM CDTFlash Flood WarningEWXKarnes113 min
Aug 31, 7:41 AM CDTFlash Flood WarningEWXBexar, Comal, Hays, Travis2 hr
Aug 31, 8:20 AM CDTFlash Flood WarningEWXDeWitt, Lavaca3 hr
Aug 31, 8:32 AM CDTFlash Flood WarningEWXFayette2 hr
Aug 31, 9:25 AM CDTFlash Flood WarningEWXGonzales, Karnes3 hr
Aug 31, 10:55 AM CDTFlash Flood WarningEWXDeWitt, Karnes, Lavaca2 hr
Aug 31, 12:50 PM CDTFlash Flood WarningEWXDeWitt, Karnes, Lavaca2 hr

Nearby

Flash Flood Warnings in Texas, 2001Every flash flood warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.